Primary biomarker of the organism's vitamin D status.
25-OH-vitamin D is the main circulating form of vitamin D, measured to assess the nutritional status in vitamin D and bone health. It reflects both sun exposure and dietary intake.
Vitamin D is synthesized by the skin under sun exposure and provided through diet, then transformed into 25-OH-vitamin D in the liver. This form circulates long-term and serves as the best indicator of vitamin D status for clinical evaluation. Vitamin D regulates calcium absorption, bone mineralization, and plays a fundamental immune role. Deficiency leads to osteomalacia, bone fragility, and increased infective susceptibility, particularly in individuals with low sun exposure.
Regulation of phosphate-calcium metabolism, immunity, and bone mineralization.
Ensure daily sun exposure of 15-30 minutes, consume fatty fish 2-3 times a week, and eggs regularly. Additional intake may be necessary in autumn-winter or based on age and medical context.
Optimal vitamin D3 levels protect the skeleton and immunity, requiring sufficient sun exposure and adequate dietary sources.
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